Ionic liquids of bis(alkylethylenediamine)silver(I) salts and the formation of silver(0) nanoparticles from the ionic liquid system
Ionic liquids of bis(alkylethylenediamine)silver(I) salts and the formation of silver(0) nanoparticles from the ionic liquid system
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DOI：
10.1002/chem.200701764
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发表时间：
2008-01-01
影响因子：
4.3
通讯作者：
Furusho, Hirotoshi
中科院分区：
文献类型：
--
作者：
Iida, Masayasu;Baba, Chihiro;Furusho, Hirotoshi
制备了过渡点分别为-54℃和-6℃的双(N-乙基己二胺)硝酸银([Ag(Eth-hex-en)(2)]NO3)和双(N-己基乙二胺)六氟磷酸银([Ag(hex-en)(2)]PF6)离子液体。在这些转变温度以下，两种银的络合物都呈现无定形状态，其中乙烷-十六烷基络合物的玻璃化程度大于十六烷基络合物的玻璃化程度。在30℃(或35℃)和70℃之间测量的两种络合阳离子的扩散系数在很大程度上依赖于温度；对于低于40℃的乙二醇六烯络合阳离子，这种依赖性尤其大。小角X射线散射研究表明，两种银络合物的金属络合物的双层结构都是在液态下形成的。通过透射电子显微镜对淡黄色的[Ag(eth-hex-en)，]NO液体的直接观察表明，纳米结构的存在，作为微乳液，小于5 nm。这种结构在[Ag(己烯)(2)]PF6液体中观察不清楚。尽管[Ag(ethhex-en)(2)]NO3液体在水中的溶解度很低，但它很容易与少量的水结合，直到[水]/[金属络合物]=7：1。在水中，[Ag(eth-hex-en)(2)]NO3液体与NaBH4水溶液还原得到了尺寸均匀的银(0)纳米粒子，而[Ag(hex-en)(2)]PF6液体以同样的方式不能形成银(0)纳米粒子。
We have prepared novel ionic liquids of bis(N-2-ethylhexylethylenediamine)silver(I) nitrate ([Ag(eth-hex-en)(2)]NO3 and bis(N-hexylethylenediamine)silver(I) hexafluorophosphate ([Ag(hex-en)(2)]PF6), which have transition points at -54 and -6 degrees C, respectively. Below these transition temperatures, both the silver complexes assume amorphous states, in which the extent of the vitrification is larger for the eth-hex-en complex than for the hex-en complex. The diffusion coefficients of both the complex cations, measured between 30 (or 35) and 70 degrees C, are largely dependent on temperature; the dependence is particularly large in the case of the eth-hex-en complex cation below 40 degrees C. Small-angle X-ray scattering studies showed that the bilayer structure of the metal complex is formed in the liquid state for both the silver complexes. A direct observation of the yellowish [Ag(eth-hex-en),]NO, liquid by transmission electron microscopy (TEM) indicates the presence of nanostructures, as a microemulsion, of less than 5 nm. Such structures were not clearly observed in the [Ag(hexen)(2)]PF6 liquid. Although the [Ag(ethhex-en)(2)]NO3 liquid is sparingly soluble in bulk water, it readily incorporates a small amount of water up to [water]/[metal complex] = 7:1. Homogeneous and uniformly sized silver(0) nanoparticles in water were created by the reduction of the [Ag(eth-hex-en)(2)]NO3 liquid with aqueous NaBH4, whereas silver(0) nanoparticles were not formed from the [Ag(hex-en)(2)]PF6 liquid in the same way.